A non-sterile device designed to be inserted into a patient's mouth to facilitate access to the respiratory system. It is typically a small rigid or semi-rigid plastic hollow device with a shape and structure that provides an appropriate gastight seal (i.e., with a patient's lips) and prevents collapse. The device is typically attached, either directly or through other tubes/adapters, to diagnostic and/or therapeutic respiratory devices (e.g., ventilator, inhaler, incentive spirometer, aerosol equipment). This is a reusable device.